I don't think I've ever heard anyone that is both in favor of teaching creationism and able to successfully explain what the word "theory" means. Most seem to think it means "guess" or "idea" instead of its actual definition: Explanation that is supported by the underlying science. Evolution is a theory, creationism is an idea.

Other popular theories that creationists don't seem to have a problem with:

Gravity
Quantum mechanics
Lister's germ theory
Pretty much every other concept in the history of science